When choosing erhu, the first thing to look at is what kind of wood it is made of. Generally speaking, the erhu of mahogany, ebony and red sandalwood is the best. Then look at its python skin, the old python skin is better than the new python skin. The new python skin is oily and the sound quality is not pure; the old python skin is sensitive in pronunciation and pure in sound quality. If the scale is too small, the skin of the python is too thin and tender, and the pronunciation is thin; if the scale is too large, the skin is too hard, and the pronunciation is delayed and obscure. Don't choose python skin with large scales on one side and small scales on the other. It is best to choose python skin with uniform scale, smooth and moderate thickness.

The choice of the bow is very important. The bow is too short and cannot be drawn; the bow is too thin and the pronunciation is weak; Straight and flexible, the bow should preferably have a bamboo joint. The bow without a bamboo joint is too soft and the elasticity is too large. The bow hair of the erhu is divided into white horsetail and black horsetail. The black horsetail is thicker and harder, and it is better to pull the banhu; the white horsetail is thinner and softer, and it is more suitable to pull the erhu.

There are two kinds of erhu strings: metal strings and silk strings. Metal strings not only sound loud, pure sound quality, beautiful timbre, but also not easy to break and go out of tune. These advantages of metal strings are also the disadvantages of silk strings, so metal strings are generally used instead of silk strings.

The weight of the erhu is generally made of strings and silk ropes tied between the strings and the piano rod. The width of a thousand pounds is very important. Too wide or too narrow is not ideal for pronunciation, and it is not convenient for fingers to press strings. Generally, the width of a thousand pounds (the distance between the strings and the piano rod) is 1.5-1.8 cm. The fixed jins sold on the market, which are fixed on the strings with screws, are also ideal.

The piano code is also called the sound bridge. Because the materials used to make the bridge are different, the pronunciation is also different. In terms of materials, there are bamboo and wooden (also divided into pine, poplar, pine, mahogany, ebony, etc.). In terms of shape, there are hollow yards, solid yards, round yards, long yards and so on.

Generally speaking, the pronunciation of bamboo bridges is crisp and bright, and the pronunciation of wooden bridges is soft; hollow bridges are louder than solid bridges, and solid bridges have thicker pronunciation; smaller bridges have a louder volume and more empty pronunciation, and larger bridges The volume is low, but the pronunciation is softer. There are also paper roll codes and pencil codes. The pronunciation of mahogany and ebony code is ideal, but it is not sold on the market, so I have to make it myself.